/control/verbose 0
/tracking/verbose 0
/event/verbose 0
/run/initialize
/gps/particle gamma
/gps/verbose 2
/gps/type Surface
/gps/shape Cylinder
/gps/centre 2. 2. 2. cm
/gps/radius 2.5 cm
/gps/halfz 5. cm
/gps/angtype cos
/gps/energytype Cdg
/gps/emin 20. keV
/gps/emax 1. MeV
/gps/calculate
/run/beamOn 10000